package com.atguigu.cloud.mygateway;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Slf4j
@Component
public class MyGlobalFilter implements GlobalFilter, Ordered {
	
	/**
	 * 数字越小优先级越高
	 * @return
	 */
	@Override
	public int getOrder()
	{
		return 0;
	}
	
	private static final String BEGIN_VISIT_TIME = "begin_visit_time";//开始访问时间
	/**
	 *第2版，各种统计
	 * @param exchange
	 * @param chain
	 * @return
	 */
	@Override
	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
		//先记录下访问接口的开始时间
		exchange.getAttributes().put(BEGIN_VISIT_TIME, System.currentTimeMillis());
		
		return chain.filter(exchange).then(Mono.fromRunnable(()->{
			Long beginVisitTime = exchange.getAttribute(BEGIN_VISIT_TIME);
			if (beginVisitTime != null){
				log.info("访问接口主机: " + exchange.getRequest().getURI().getHost());
				log.info("访问接口端口: " + exchange.getRequest().getURI().getPort());
				log.info("访问接口URL: " + exchange.getRequest().getURI().getPath());
				log.info("访问接口URL参数: " + exchange.getRequest().getURI().getRawQuery());
				log.info("访问接口时长: " + (System.currentTimeMillis() - beginVisitTime) + "ms");
				log.info("我是美丽分割线: ###################################################");
				System.out.println();
			}
		}));
	}
}